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118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).
In English, the omission of the definite article ("Crimea" rather than "the Crimea") became common during the later 20th century. [citation needed]The spelling "Crimea" is from the Italian form, la Crimea, since at least the 17th century [3] and the "Crimean peninsula" becomes current during the 18th century, gradually replacing the classical name of Tauric Peninsula in the course of the 19th ...
Bessel functions describe the radial part of vibrations of a circular membrane.. Bessel functions, first defined by the mathematician Daniel Bernoulli and then generalized by Friedrich Bessel, are canonical solutions y(x) of Bessel's differential equation + + = for an arbitrary complex number, which represents the order of the Bessel function.